Arnovit



(No Modl.)

A, WOLFE. VENTILATOR FOR BUILDINGS.

' Patented Nov. 12, 1889.

N. PETERS Pnulo-Limu n her. Washingicll. D. c.

' UNITED STATES PATENT ()FFICEQ AENOVITZ -WOLFF, OF NEW YORK, N. Y.

VENTILATOR FOR BUILDINGS.

SPECIFICATION forming part of Letters Patent No. 414,851, dated November 12, 1889.

Application filed December 19, 1888. Serial No. 294,047. (No model.)

To all whom it may concern:

Be it known that I, ARNOVITZ WOLFF, of the city and State of New York, have invented au Improvement in Ventilators for Buildings, of which the following is a specification.

My ventilator is especially adapted for dwellings, and in which the same can be applied to an opening through the wall into the chimney-flue; but the same might be used with an opening through a Window or casing leading to the external atmosphere.

Ventilating windows and panels have been made use of in which pivots or hinges at the top or bottom edges have been provided for the, Window or panel to swing upon, and such ventilators have been opened by the action of a spring or Weight and closed by a cord. In my improvement I make use of a valve or cover swinging on a vertical hinge, to which a spring is applied for opening the valve or cover, and a cord is made use of for closing the same and a spring-latch for keeping the valve or cover closed, and to this spring-latch a cord is attached, so that the ventilator may be opened by the action of the spring when the cord is pulled upon.

In the drawings, Figure 1 is an elevation of my ventilator with the cover or valve opened. Fig. 2 is a horizontal section with the cover closed. Fig. 3 is a sectional elevation of the latch, and Fig. 4 is a view of the fan-wheel edgewise of the same.

The ring or border'A is attached to a cylinder B, which is of greater, or less length and adapted to pass into the brick-work of the wall to the flue or chimney, or to pass through, a window or casing wherever the ventilator is to be applied. This ring A and cylinder B are to be securely fastened in position. Upon the ring A at one side is aver-- tical hinge O, by which the cover or valve D is attached, and there is a helical spring E around the pivot-wire of the hinge, with the ends bearing against the ring and the valve, respectively, and placed in such a manner that the spring tends to swing the cover and open 7 the ventilator, andthere is a cord F attached the spring-latch K, the end of which is beveled so that the projection H moves against the inclined upper surface of the spring-latch to force it down as the cover is closed, and as the cover reaches the ring A the latch K springs up so that its notch receives the projection H, and there is a cord L attached to the spring-latch K, so that the same may be pulled down to unlatch the projection H and allow the cover or valve D to be swung open by the spring E.

The spring of the latch K may be of any desired character. I have, however, shown a helical spring at N to act upon the latch K .andiraise the outer end to cause it to engage inder .B is provided with an inwardly-pro jeoting flange 3 at the back end to prevent the fan M and cylinder P slipping out into the The fans heretofore made use of usually have blades that are of flat sheet metal, twisted so as to stand at an inclination to a plane passing through the axis ofthe fan. I11 place of having these blades flat I make them concave, similar to wedge-shaped sections of the sheet-metal cylinder, and these are placed upon the shaft, with the rear edge of one slightly behind the front edge of the next, so as to give'spaoe for the passage of air along or through the ventilator, and the curved shape that is given to these blades causes them to turn freely and with sufficient rapidity; but such blades prevent the air- I claim as my invention der 1) Without disturbing sneh cylinder B or The cembinatiomwith the ring A, cylinder the cover, substantially as set forth. IO B, and swinging valve or cover ll), of a sepn- Signed by me this 15th day of December, rate removable eylinder P Within the eylin- 1888. 5 der B, a fan within the cylinder 1, and eross- ARNOVITZ "OL'FF.

bars for supporting the axis of the fan, Witnesses: whereby the fan and its cylinder can be in- GEO. 'l. PINCKNEY, trodneed within or removed from the eylilv \VILLIAM G. lvln'r'l. 

